ATDH CHEMISTRY EXAM QUESTIONS
AND ANSWERS (ALREADY GRADED
A+)
Atom - ANSWER-Smallest unit of an element
Molecule - ANSWER-Atom bonded to at least one other atom
Ion - ANSWER-Atom that has lost or gained an electron
Compound - ANSWER-2+ different elements
Diatomic elements - ANSWER-H2, N2, O2, F2, Cl2, Br2, I2
Allotropes - ANSWER-Elemental molecules with different formulas
Ionic compounds - ANSWER-Metal and nonmetal (can be polyatomic too)
Molecular compounds - ANSWER-Two or more nonmetals
Naming ionic compounds - ANSWER-1. name the metal
2. write the metal's oxidation state as a Roman numeral in parenthesis (skip for columns
one and two)
3. Name the nonmetal using an "ide" ending
MgF2 - ANSWER-magnesium fluoride
FeCl3 - ANSWER-Iron (III) chloride
SnF2 - ANSWER-Tin (II) fluoride
SnF4 - ANSWER-Tin (IV) fluoride
Fe(NO3)2 - ANSWER-Iron (II) Nitrate
NH4Cl - ANSWER-Ammonium chloride
Al2O3 - ANSWER-Aluminum oxide
FeCl2 - ANSWER-Iron (II) chloride
Ammonium chloride - ANSWER-NH4Cl
, Iron (III) cyanide - ANSWER-Fe(CN)3
Magnesium sulfate - ANSWER-MgSO4
Ammonium sulfate - ANSWER-(NH4)2SO4
FeCO3 - ANSWER-Iron (II) carbonate
Fe(CN)3 - ANSWER-iron (III) cyanide
Al(OH)3 - ANSWER-Aluminum hydroxide
CsNO3 - ANSWER-Cesium nitrate
Zn3(PO4)2 - ANSWER-Zinc phosphate
(NH4)2SO4 - ANSWER-Ammonium sulfate
On average, hummingbirds fly at 30 miles/hr. Convert this speed to m/s. (1 m=3.28 feet
and 1 mile=1.61 km) - ANSWER-13.3
The brooklyn bridge is 277 feet tall. convert this to meters (1 m=3.28 ft) - ANSWER-84.5
In a vacuum, light travels at a speed of 2.998x10^8 m/s. Convert this to miles/hour (1
mile=1.61 km) - ANSWER-6.7x10^8
What is the empirical formula of a compound that is 17.3% H and 82.7% C? -
ANSWER-C2H5
The empirical formula of a compound with molecules containing 12 carbon atoms, 14
hydrogen atoms, and 6 oxygen atoms is - ANSWER-C6H7O3
Calculate the percent composition, by mass, of carbon:
C17H21NO4 - ANSWER-67.3%
Calculate the percent composition, by mass, of carbon:
C55H75Cl2N9O24 - ANSWER-50.2%
Naming molecular compounds - ANSWER-1. Give the appropriate numerical prefix to
the first element
2. Name the first element using its regular name on the periodic table
3. Give the appropriate numerical prefix to the second element
4. Name the nonmetal using an "ide" ending
AND ANSWERS (ALREADY GRADED
A+)
Atom - ANSWER-Smallest unit of an element
Molecule - ANSWER-Atom bonded to at least one other atom
Ion - ANSWER-Atom that has lost or gained an electron
Compound - ANSWER-2+ different elements
Diatomic elements - ANSWER-H2, N2, O2, F2, Cl2, Br2, I2
Allotropes - ANSWER-Elemental molecules with different formulas
Ionic compounds - ANSWER-Metal and nonmetal (can be polyatomic too)
Molecular compounds - ANSWER-Two or more nonmetals
Naming ionic compounds - ANSWER-1. name the metal
2. write the metal's oxidation state as a Roman numeral in parenthesis (skip for columns
one and two)
3. Name the nonmetal using an "ide" ending
MgF2 - ANSWER-magnesium fluoride
FeCl3 - ANSWER-Iron (III) chloride
SnF2 - ANSWER-Tin (II) fluoride
SnF4 - ANSWER-Tin (IV) fluoride
Fe(NO3)2 - ANSWER-Iron (II) Nitrate
NH4Cl - ANSWER-Ammonium chloride
Al2O3 - ANSWER-Aluminum oxide
FeCl2 - ANSWER-Iron (II) chloride
Ammonium chloride - ANSWER-NH4Cl
, Iron (III) cyanide - ANSWER-Fe(CN)3
Magnesium sulfate - ANSWER-MgSO4
Ammonium sulfate - ANSWER-(NH4)2SO4
FeCO3 - ANSWER-Iron (II) carbonate
Fe(CN)3 - ANSWER-iron (III) cyanide
Al(OH)3 - ANSWER-Aluminum hydroxide
CsNO3 - ANSWER-Cesium nitrate
Zn3(PO4)2 - ANSWER-Zinc phosphate
(NH4)2SO4 - ANSWER-Ammonium sulfate
On average, hummingbirds fly at 30 miles/hr. Convert this speed to m/s. (1 m=3.28 feet
and 1 mile=1.61 km) - ANSWER-13.3
The brooklyn bridge is 277 feet tall. convert this to meters (1 m=3.28 ft) - ANSWER-84.5
In a vacuum, light travels at a speed of 2.998x10^8 m/s. Convert this to miles/hour (1
mile=1.61 km) - ANSWER-6.7x10^8
What is the empirical formula of a compound that is 17.3% H and 82.7% C? -
ANSWER-C2H5
The empirical formula of a compound with molecules containing 12 carbon atoms, 14
hydrogen atoms, and 6 oxygen atoms is - ANSWER-C6H7O3
Calculate the percent composition, by mass, of carbon:
C17H21NO4 - ANSWER-67.3%
Calculate the percent composition, by mass, of carbon:
C55H75Cl2N9O24 - ANSWER-50.2%
Naming molecular compounds - ANSWER-1. Give the appropriate numerical prefix to
the first element
2. Name the first element using its regular name on the periodic table
3. Give the appropriate numerical prefix to the second element
4. Name the nonmetal using an "ide" ending
